Concept explainers
Videos
How are distant (young) galaxies different from the galaxies that we see in the universe today?
To explain:
The difference between distant young galaxies and the galaxies that are seen in the universe today.
Explanation of Solution
Introduction:
Distant young galaxies are different from present day galaxies in terms of star formation, composition and shape. Distant galaxies were present at the time when the universe was only 500 million years old while present day galaxy is about 13.8 years old.
Distant galaxies were small as compared to present day galaxy and rate of star formation was very high in young galaxies and they were numerous, less luminous and rich in gas.
Distant galaxies were small and elliptical as at that time, spiral arms, bulges and disks were not there.They contain mostly old stars and they were irregular and smaller than present day galaxies. Present day galaxies are spiral in shape and they contain young stars with interstellar matter.
Formation of larger galaxies is the result of combination of fragment of old galaxies. The color of galaxy indicates the age of star by which it is populated.Blue galaxies contain hot stars and star formation occurs at high rate.
Conclusion:
Thus,Distant galaxies were small as compared to present day galaxy and rate of star formation was very high in young galaxies and they were numerous, less luminous and gas rich.
Want to see more full solutions like this?
Chapter 28 Solutions
Astronomy
Additional Science Textbook Solutions
Modern Physics
Conceptual Physics (12th Edition)
Physics for Scientists and Engineers with Modern Physics
College Physics
Physics for Scientists and Engineers: A Strategic Approach with Modern Physics (4th Edition)
Essential University Physics: Volume 1 (3rd Edition)
- If all distant galaxies are expanding away from us, does this mean we’re at the center of the universe?arrow_forwardWhat do we now understand to be the primary difference between normal galaxies and active galaxies?arrow_forwardWhy did it take so long for the existence of other galaxies to be established?arrow_forward
- What is the most useful probe of the early evolution of the universe: a giant elliptical galaxy or an irregular galaxy such as the Large Magellanic Cloud? Why?arrow_forwardThinking about the ideas of space and time in Einstein’s general theory of relativity, how do we explain the fact that all galaxies outside our Local Group show a redshift?arrow_forwardSuppose the stars in an elliptical galaxy all formed within a few million years shortly after the universe began. Suppose these stars have a range of masses, just as the stars in our own galaxy do. How would the color of the elliptical change over the next several billion years? How would its luminosity change? Why?arrow_forward
- What are the advantages and disadvantages of using quasars to probe the early history of the universe?arrow_forwardWhat is the difference between hot dark matter and cold dark matter? How does this difference affect cosmology?arrow_forwardWhere might the gas and dust (if any) in an elliptical galaxy come from?arrow_forward
- Astronomers have been making maps by observing a slice of the universe and seeing where the galaxies lie within that slice. If the universe is isotropic and homogeneous, why do they need more than one slice? Suppose they now want to make each slice extend farther into the universe. What do they need to do?arrow_forwardBased on your analysis of galaxies in Table 26.1, is there a correlation between the population of stars and the quantity of gas or dust? Explain why this might be.arrow_forward
AstronomyPhysicsISBN:9781938168284Author:Andrew Fraknoi; David Morrison; Sidney C. WolffPublisher:OpenStax
Stars and Galaxies (MindTap Course List)PhysicsISBN:9781337399944Author:Michael A. SeedsPublisher:Cengage Learning
Foundations of Astronomy (MindTap Course List)PhysicsISBN:9781337399920Author:Michael A. Seeds, Dana BackmanPublisher:Cengage Learning
Stars and GalaxiesPhysicsISBN:9781305120785Author:Michael A. Seeds, Dana BackmanPublisher:Cengage Learning